Here's a HA rendition of the popular Seagull Nebula between Monoceros and Canis Major. Waiting for more clear sky opportunities to run the other NB filters through this.
IC2177 (Seagull Nebula)
IC2177 (Seagull Nebula)
Hi everyone,
Here's a HA rendition of the popular Seagull Nebula between Monoceros and Canis Major. Waiting for more clear sky opportunities to run the other NB filters through this.
Here's a HA rendition of the popular Seagull Nebula between Monoceros and Canis Major. Waiting for more clear sky opportunities to run the other NB filters through this.
Last edited by rcj on Sat Feb 19, 2011 3:04 pm, edited 1 time in total.
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been reworking on the HA and OIII data for Seagull again. Improving on the colorized version earlier posted today.
So far, the capture breakdown is:
HA: 140min
OIII: 100min
Technically, we should strive to have more OIII data as the HA is overwhelming, but because this nebula is purely emissive, it passes of OK. At the moment I have three subs of SII but only one sub is acceptable, and as such, can't include it to provide a full colorized version - hence a bicolor composite as presented above. Depending on how one assigns the colour palette, the nebula will be presented in a different way (in terms of colour). Typically, we have the Hubble palette where the assignment is as follows:
Red is assigned SII
Green is assigned HA
Blue is assigned OIII
Now if you look into this palette further, nominally for an object like the Seagull where it is purely emissive, the HA component will dominate much more than the other two components, giving it a very green appearance. Now this may not look good or "look right" to most people and as such, further processing is done upon this to make it look more balanced (reducing the green, irony to obtaining seemingly precious HA data in our skies!). Also, it is advised to actually take more OIII and SII as they are relatively "weak" in most nebula objects. Will see how this goes in the following nights to come, as more SII data is captured for this object.
So far, the capture breakdown is:
HA: 140min
OIII: 100min
Technically, we should strive to have more OIII data as the HA is overwhelming, but because this nebula is purely emissive, it passes of OK. At the moment I have three subs of SII but only one sub is acceptable, and as such, can't include it to provide a full colorized version - hence a bicolor composite as presented above. Depending on how one assigns the colour palette, the nebula will be presented in a different way (in terms of colour). Typically, we have the Hubble palette where the assignment is as follows:
Red is assigned SII
Green is assigned HA
Blue is assigned OIII
Now if you look into this palette further, nominally for an object like the Seagull where it is purely emissive, the HA component will dominate much more than the other two components, giving it a very green appearance. Now this may not look good or "look right" to most people and as such, further processing is done upon this to make it look more balanced (reducing the green, irony to obtaining seemingly precious HA data in our skies!). Also, it is advised to actually take more OIII and SII as they are relatively "weak" in most nebula objects. Will see how this goes in the following nights to come, as more SII data is captured for this object.